As this chart from Statista shows, though, Walmart has plenty of ground to make up. As you'd expect, Amazon was far and away the go-to choice for America's online shoppers in 2015, generating an estimated $92.4 billion in ecommerce sales. That was almost four times as much as second-place Apple's $24.4 billion, and well ahead of Walmart's $13.7 billion.

Ecommerce isn't the same as commerce, and Walmart still generates way more overall revenue than Amazon. But as more and more customers take their business online, Walmart clearly thinks it's time to try closing that gap.

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